TM 1-1520-238-T-4
6–149
6–72.
HOD NGB 2 READING – DISPLAYS 140 C OR HIGHER OIL TEMPERATURE
6–72
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Tool Kit, Powertrain
SC518099CLA013
Repairer’s
Adapter, Straight Pipe
A1100-4-4
to Tube, Female
Pipe End, 37 Flared
Gage Pressure, Dial
GGG76
Indicating
(0-200 PSI)
Multimeter, Digital
AN/PSM-45
Personnel Required:
68D
Aircraft Powertrain Repairer/NDI
68F
Aircraft Electrician
152FG
Maintenance Test Pilot
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
TM 1-1520-238-CL
TM 9-1230-476-20-2
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
R200 panel and RN6,
R60 fairings access
open
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. Visually inspect oil system 2 for low oil level and
damage (TM 1-1520-238-23).
Is damage present?
YES
Replace NGB2
(TM 1-1520-238-23).
NO
Go to step 2.
2. Remove NGB 2 oil pressure transducer
(TM 1-1520-238-23). Install pressure gage. Start
engine 2 and place PWR lever to FLY
(TM 1-1520-238-CL). Operate until readings
stabilize.
Is oil pressure above 28 LB on pressure
gage?
YES
Go to step 3.
NO
Replace NGB2
(TM 1-1520-238-23).
3. Check for 28 VDC between J60–F and J60–G.
Is voltage present?
YES
Go to step 4.
NO
Go to step 5.
4. Check for 10 VDC between P672–87 and
P672–86.
Is voltage present?
YES
Refer to TM 9-1230-476-20-2 to
troubleshoot multiplex
subsystem.
NO
Go to step 6.
5. Check for 28 VDC at J60–F.
Is voltage present?
YES
Repair open wire between
J60–G and GS542–A.
Go to paragraph 6–13.
NO
Go to step 7.
6. Check for open between P60–H and P60–J.
Does open exist?
YES
Replace NGB 2 oil temperature
probe (TM 1-1520-238-23).
NO
Go to step 8.
